chore(logic/hydra): tweak docs + minor golf (#14579)
chore(logic/hydra): tweak docs + minor golf (#14579)

Co-authored-by: @alreadydone 



Co-authored-by: Junyan Xu <4b21477206f519dfb2e8013c7484765ce2c899c9@gmail.com>

leanprover-community/mathlib,leanprover-community/mathlib